Gear-grinding machine



Oct. 11 1927. 89

- LE ROY E. JOLLS GEAR GRINDING MACHINE Filed Aug. 2, 1925 5 Sheets-Sheet 1 J INVENTOB.

A TTORNEY LE ROY E. JOLLS GEAR GRINDING MACHINE Filed Aug. 2. 1923 5 Sheets-Sheet 2 m mun m \muu 7 INVENTOR.

Mr W

c I I i O t 1927 LE ROY E.- JOLLS GEAR GRINDING MACHINE Filed Aug. 2, 192 5 Sheets-Sheet 3 INVENTOR. jzzz zvozzs I H ZZSATTORNEY Oct. 9 E ROY E, JOLLS 5 Sheets-Sheet 4 1,645,489 Oct. 11 1927. LE ROY JOLLS GEAR GRINDING MACHINE Filed Aug. 2, 1925 5 Sheets-Sheet 5 a v Q l 1 i Q l I v EN O a jg Zgyfl. M014? Patented Got. 11, 1927.

LE ROY E. JOLLS, OF DETROIT, MICHIGAN, ASSIGN OR, BY MESNE ASSIGNMENTS, TO GLEASON WORKS, OF ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK.

GEAR-GRINDIN G MIA-CHIN E.

Application filed August 2, 1923. Serial No. 655,248.

My invention relates to a gear grinding machine, and has particular reference to a mechanism adapted for operation on lengthwise curved tooth gears, sometimes known as spiral or circular tooth gears, the present invention being intended principally for generating the profiles of such lengthwise curved teeth, or operating in curved slots of similar articles.

A primary object of the invention is to provide a practicable, eflicient and simplified mechanism for carrying out the grinding or generating of a curved tooth gear accurately, and in a commercial way.

To these ends, the invention comprises the features and details of parts, that will appear clearly from the following description, when read in conjunction with the accompanying drawings, the novel features being pointed out in the claims appearing at the end of the description.

in the drawings:

Figure l is a plan view of a gear grinding machine, equipped in accordance with one embodiment of the invention;

Figure 2 is a longitudinal sectional view of the grinding member and its supporting shaft;

Figure 3 is a side elevation of the support for the grinding member and its operating motor;

Figure 4 is an enlarged sectional view, showing the motor shaft, and its connection with the shaft on which the grinding member is mounted;

Figure 5 is an end view of the housing around the grinding member;

Figure 6 is a sectional view on line 6-6 of Figure 5;

Figure 7 is a partial sectional view showing the dressing mechanism in reversed position;

Figure 8 is a sectional view through the dressing mechanism;

Figure 9 is a sectional view on line 9-9 of Figure 2, and

Figure 10 is a sectional view on line 10-10 of Figure 3.

The structure illustrated in the'within disclosure, which is intended merely as one example of various possible practical adaptations of the improvements, includes a gear blank carrier 1, while 2 designates an oscillatory cradle on which the grinding mechanism is mounted, the relative movements to what is shown in ticularly with the mechanism for mounting and operating the grinding member.

3 designates generally a support for the grinding member and operating parts, said support being secured to a head that is adjustable vertically and horizontally on the aforementioned cradle similarly to the adjustable cutter head support of the aforementioned patents. Suitably mounted upon the support 3 is an electric motor 4, including a motor or driving shaft 5, which has a splined connection with the driven shaft 6, so as to effect rotation of the shaft 6 and permit endwise movement thereof relatively to the shaft 5. The shaft 6 has suitably fixed thereon a grinding member 7, which has opposite inclined faces arranged to engage adjacent faces of teeth on a gear blank. The grinding member is formed of suitable abrasive material, and is of annular face mill type for cooperation with lengthwise curved teeth on a gear, or with other curved slot work.

in order to permit endwise movement of the grinding member, relatively to the blank, I employ a box 8, see Figure 2, which has a threaded portion cooperating with an adjusting nut 9, the latter being actuated by an adjusting worm 10. The box 8 supports the driven shaft 6 on which the grinding member is mounted, and is provided with a radial bearing 11 arranged between the box and the driven shaft 6, while 12 designates a thrust bearing located between the body portion of the box and an independent end portion 13.

14 designates a collar fixedly secured to the driven shaft. 6, while 15 designates springs located between the collar 14 and the end portion l3'of the box, acting to retain the grinding .member in normal position and hold it against endwise movement relatively to the box 8, and when it is desired to retract the grinding member from the gear blank, this is accomplished by movingthe box 8 endwise through the mechanism already described 16 designates a protective housing fixed to the support and surrounding the grinding member 7, while 17 designates generally a support or barrel mounted on the housing 16 and preferably formed integral therewith, and comprising part of a dressing mechanism, which is otherwise constructed similar to a mechanism disclosed in copending application executed of even date with the present application.

The dressing mechanism includes a holder 18 for a dressing device, said holder being operable endwise across the inclined faces of the grinding member by means of a screw 19, and mounted within an oscillatory carrier 20, which is adjustable from the position shown in Figure 6 to that shown in Figure 7, for cooperation with opposite faces of the grinding member, while 21 is a fixed holder provided with a dressing device adapted to cooperate with the outer edge of the driving member.

The carrier 20 is retained in one or the other of its positions of adjustment by a spring-actuated bolt 22, which is moved outwardly against the action of spring 23 to release the carrier for such adjustment.

While the invention has been described with reference to a particular mechanism, it is not confined to the precise disclosure set forth, and this application is intended to cover such changes or modifications as may come within the intended purposes of the improvements or the scope of the following claims.

I claim:

1. A gear grinding machine comprising a blank carrier, a support,a driving shaft mounted on the support, a driven shaft operated by the driving shaft and having endwise movement relatively thereto, an endwise adjustable box in which the driven shaft is supported, a collar attached to the driven shaft, and springs located between said collar and said endwise adjustable box and acting to hold the shaft against endwise movement relatively to the box.

2. A gear grinding machine comprising a support, a driving shaft mounted on the support, a driven shaft also mounted on the support and operatively connected with the driving shaft for rotation therewith and endwise movement relatively thereto, an endwise adjustable box within which the driven shaft is mounted, said box including an end portion and a body portion, a thrust bearing between said end portion and the body portion, a radial bearing between the body portion and the driven shaft, a collar attached to said shaft, and springs located between said collar and'the end portion of the box and acting to hold the driven shaft 1zigainst endwise movement relatively to the 3. A gear grinding machine comprising a support, a driving shaft mounted on the support, a driven shaft operated by the driving shaft and having endwise movement relatively thereto, an endwise adjustable box in which the driven shaft is yieldably supported, and means for adjusting the box and driven shaft endwise.

4. A gear grinding machine comprising a support, a driving shaft mounted on the support, a driven shaft operated by the driving shaft and having endwise movement relatively thereto, an endwise adjustable box in which the driven shaft is supported, radial and thrust bearings permitting relative rotation between the driven shaft and the box, a collar loosely mounted on said driven shaft and bearing against said thrust hearing, a second collar fixed to said driven shaft, resilient means connecting said first collar and said second collar, and means for adjusting the box endwise.

5. A gear grinding machine comprising a support, a driving shaft mounted on the support, a driven shaft operated by the driving shaft and having endwise movement relatively thereto, an endwise adjustable box, means for supporting the driven shaft in said box to permit relative endwise yielding movement and acting to hold said parts normally against such relative endwise movement, radial and thrust bearings permitting relative rotation between the box and the driven shaft, and means for adjusting the box endwise.

In witness whereof, I have hereunto signed my name.

LE ROY E. JOLLS. 

